All-terrain vehicle and its hydraulic braking device

Abstract

The present application discloses a hydraulic braking device and an all-terrain vehicle using the device. The device includes a pump body, a piston mechanism, a sealing mechanism, a connecting rod mechanism, and an elastic mechanism. The pump body is provided with a handbrake oil inlet, a first oil outlet, a second oil outlet, and a liquid supplement port. The handbrake oil inlet is communicated with a handbrake pump, the first oil outlet is communicated with a rear wheel braking assembly, and the second oil outlet is communicated with a front wheel braking assembly. The sealing mechanism includes a chamber seal, a first seal, and a second seal. The chamber seal divides the chamber into a first chamber and a second chamber. The piston mechanism includes a first piston and a second piston. A first compensation hole is provided on the first piston, and a second compensation hole is provided on the second piston. Through the above settings, the hydraulic braking device integrates the function of hydraulic distribution, reduces the number of the hydraulic braking device and related accessories, and has better airtightness and braking effect.

Description

Technical Field

[0001] The present application relates to the field of vehicle technology, and in particular to an all-terrain vehicle and a hydraulic brake device thereof. Background Art

[0002] All-Terrain Vehicle (ATV) is a vehicle designed for driving on unpaved roads and is suitable for various complex terrain conditions. For all-terrain vehicles controlled by steering wheels, in order to support the high mobility of the vehicle and the use requirements in complex environments, a hydraulic braking system is configured, which can convert the pedal force pressed by the driver into hydraulic pressure, and then transmit it to the brakes of each wheel through a series of mechanisms, thereby achieving the purpose of deceleration and stopping.

[0003] At present, the commonly used hydraulic brake system for all-terrain vehicles on the market is to realize the foot brake to control the four wheels and the hand brake to control the two front wheels. The control method of the hydraulic distribution valve and the hydraulic pump linkage is generally adopted. Based on this linkage control method, the foot brake and hand brake functions can be realized respectively, and the foot brake and hand brake functions do not interfere with each other. For example, a hydraulic distribution valve is configured between the hydraulic pump and the caliper corresponding to the front wheel, and the pressure generated by the hand brake pump is transmitted to the caliper corresponding to the front wheel through the hydraulic distribution valve. Part of the pressure generated by the foot brake acts directly on the caliper of the rear wheel through the hydraulic pump, and the other part acts on the caliper of the front wheel through the hydraulic distribution valve. However, for the hydraulic brake system that realizes hydraulic distribution through the hydraulic pump and the distribution valve, its structure is relatively complex and requires the layout of more pipelines, which may cause the risk of local leakage in the hydraulic brake system, seriously affecting the braking effect of the brake system. Summary of the invention

[0004] In order to address the deficiencies of the prior art, the purpose of the present application is to provide an all-terrain vehicle and a hydraulic brake device thereof, so that the hydraulic brake device integrates the function of hydraulic distribution, reduces the number of hydraulic brake devices and related accessories, and has better air tightness and braking effect.

[0005] To achieve the above objectives, this application adopts the following technical solutions:

[0006] A hydraulic braking device is applied to the hydraulic braking system of an all-terrain vehicle. The hydraulic braking system includes a front-wheel braking assembly, a rear-wheel braking assembly, and a handbrake pump. The hydraulic braking device includes: a pump body, which forms a chamber; a piston mechanism, which is disposed in the chamber and can move in the chamber; a sealing mechanism, which is installed in the chamber and fixed to the pump body; a connecting rod mechanism, which is used to drive the piston mechanism; an elastic mechanism, which is used to reset the piston mechanism. The pump body is provided with a handbrake oil inlet, a first oil outlet, a second oil outlet, and a liquid replenishing port that communicate with the chamber. The handbrake oil inlet is used to communicate with the handbrake pump through an oil pipeline. The first oil outlet is used to communicate with the rear-wheel braking assembly through an oil pipeline. The second oil outlet is used to communicate with the front-wheel braking assembly through an oil pipeline. The sealing mechanism includes a chamber seal, a first seal, and a second seal. The chamber seal cooperates with the piston mechanism to divide the chamber into a first chamber communicating with the first oil outlet and a second chamber communicating with the second oil outlet. The piston mechanism includes a first piston disposed in the first chamber and a second piston disposed in the second chamber. The first seal and the second seal are respectively sleeved on the first piston and the second piston. A first compensation hole is opened on the first piston, and a second compensation hole is opened on the second piston. The liquid replenishing port can communicate with the first chamber through the first compensation hole, and the handbrake oil inlet can communicate with the second chamber through the second compensation hole.

[0007] Further, when the elastic mechanism is in the initial state, the liquid replenishing port communicates with the first chamber through the first compensation hole, and the handbrake oil inlet communicates with the second chamber through the second compensation hole. When the elastic mechanism is in the compressed state, the first compensation hole and the second compensation hole can be blocked by the first seal and the second seal respectively, and the first chamber and the second chamber build pressure.

[0008] Further, the elastic mechanism includes a first elastic member and a second elastic member. The first elastic member is disposed between the first piston and the second piston, and the second elastic member is disposed between the second piston and the pump body. The deformation directions of the first elastic member and the second elastic member are the same, and the elastic coefficient of the first elastic member is less than the elastic coefficient of the second elastic member.

[0009] Further, the hydraulic braking system includes a brake pedal, which is connected to the connecting rod mechanism. The connecting rod mechanism can drive the first piston to move in a set direction under the action of the brake pedal. When the first piston moves, the first compensation hole is blocked by the first seal, so that the first chamber builds pressure. The oil in the first chamber can flow through the first oil outlet through the rear-wheel braking assembly. The first elastic member acts on the second piston to make the second piston move in the set direction. The second compensation hole is blocked by the second seal, so that the second chamber builds pressure. The oil in the second chamber can flow through the second oil outlet through the front-wheel braking assembly.

[0010] Further, when the linkage mechanism drives the first piston to move, the pressure in the first chamber is the first pressure, and the pressure in the second chamber is equal to the first pressure; if the handbrake pump generates pressure after the action of the linkage mechanism, the handbrake inlet can build pressure in the second chamber through the gap between the second seal and the second piston, increasing the pressure in the second chamber to the second pressure, where the second pressure is greater than the first pressure.

[0011] Further, when the handbrake pump generates pressure, the handbrake inlet can receive the oil flowing in from the handbrake pump, allowing the oil to enter the second chamber through the second compensation hole to build pressure in the second chamber, enabling the oil in the second chamber to flow through the second oil outlet to the front wheel brake assembly.

[0012] Further, when the handbrake pump generates pressure, the oil in the second chamber can flow through the second oil outlet to the front wheel brake assembly; the hydraulic braking system includes a brake pedal connected to the linkage mechanism. The linkage mechanism can drive the first piston to move in a set direction under the action of the brake pedal. If the linkage mechanism drives the first piston to move in the set direction after the action of the handbrake pump, the first compensation hole is blocked by the first seal, building pressure in the first chamber, and the oil in the first chamber can flow through the first oil outlet to the rear wheel brake assembly.

[0013] Further, a limiting hole is provided on the side wall of the first piston or the second piston, and a limiting member fixed to the pump body is provided in the limiting hole to limit the maximum displacement of the piston mechanism.

[0014] Further, the limiting hole penetrates the second piston radially, and the limiting hole is provided as an oval hole, where the length of the waist of the oval hole is equal to the maximum displacement distance of the piston mechanism.

[0015] Further, a first liquid storage chamber is formed around the first piston. The first liquid storage chamber is communicated with the first compensation hole, and the first liquid storage chamber includes an opening communicated with the first chamber. The opening direction of the first liquid storage chamber faces the second piston, and at least part of the first elastic member is arranged in the first liquid storage chamber;

[0016] A second liquid storage chamber is formed around the second piston. The second liquid storage chamber is communicated with the second compensation hole, and the second liquid storage chamber includes an opening communicated with the second chamber. The opening direction of the second liquid storage chamber is the same as that of the first liquid storage chamber, and at least part of the second elastic member is arranged in the second liquid storage chamber.

[0017] Further, the piston mechanism includes a guide member arranged between the first piston and the second piston. The first piston includes a first positioning portion extending along its axial direction. The first positioning portion is located in the first liquid storage chamber, and at least part of the first positioning portion passes through the guide member and is in clearance fit with the guide member;

[0018] The guide member is disposed between the second piston and the pump body. The second piston includes a second positioning portion extending along its axial direction. The second positioning portion is located in the second liquid storage cavity. At least a part of the second positioning portion penetrates through the guide member and is in clearance fit with the guide member.

[0019] In a second aspect, the present application further provides an all-terrain vehicle, including a vehicle frame; a suspension system connected to the vehicle frame; a traveling system connected to the suspension system, the traveling system including a front wheel and a rear wheel; a steering system connected to the front wheel, the steering system including a steering handle; a hydraulic braking system including a front-wheel braking assembly, a rear-wheel braking assembly, and a handbrake pump. The front-wheel braking assembly is installed on the front wheel, the rear-wheel braking assembly is installed on the rear wheel, and the handbrake pump is installed on the steering handle.

[0020] Furthermore, the hydraulic braking system further includes an anti-lock mechanism connecting the front-wheel braking assembly and the rear-wheel braking assembly. The anti-lock mechanism includes two hydraulic circuit interfaces, and the two hydraulic circuit interfaces are respectively connected to the first oil outlet and the second oil outlet.

[0021] The hydraulic braking device provided by the present application integrates a hydraulic distribution function. Under the input change of the brake pedal and / or the handbrake pump, the cooperation of the piston mechanism, the elastic mechanism, and the link mechanism is used to control the output situation of different oil outlets to change, so as to achieve the control of the front-wheel braking assembly and the rear-wheel braking assembly through different control methods. The hydraulic braking system requires fewer components for hydraulic transmission, improves the airtightness of the hydraulic braking system, and has a more stable braking effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a schematic diagram of the all-terrain vehicle in the embodiment of the present application;

[0023] Figure 2 is a schematic diagram of the hydraulic braking system in the embodiment of the present application;

[0024] Figure 3 is a partial sectional structure schematic diagram of the hydraulic braking device in the embodiment of the present application;

[0025] Figure 4 is an exploded view of the hydraulic braking device from a first perspective in the embodiment of the present application;

[0026] Figure 5 is an exploded view of the hydraulic braking device from a second perspective in the embodiment of the present application;

[0027] Figure 6 is a sectional view of the elastic mechanism of the hydraulic braking device in the initial state in the embodiment of the present application;

[0028] Figure 7A sectional view of the elastic mechanism of the hydraulic braking device in the compression state in the embodiment of the present application;

[0029] Figure 8 A flowchart of the hydraulic braking device in the first operating condition in the embodiment of the present application;

[0030] Figure 9 A flowchart of the hydraulic braking device in the second operating condition in the embodiment of the present application;

[0031] Figure 10 A flowchart of the hydraulic braking device in the third operating condition in the embodiment of the present application;

[0032] Figure 11 A flowchart of the hydraulic braking device in the fourth operating condition in the embodiment of the present application. Detailed implementation manners

[0033] In order to enable those skilled in the art to better understand the solution of the present application, the technical solutions in the specific embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present application.

[0034] It should be noted that the orientation nouns such as up, down, left, right, front, and back mentioned herein, or ordinal numbers such as "first" and "second", are all introduced for the convenience of description based on the accompanying drawings of the specification as a reference, and do not mean any limitation on the order of the components. In addition, since the functions of some parts of the components provided in the above embodiments are the same, the present specification uses a unified naming method for these parts. The above has introduced the pipeline connection device provided by the related technical solutions in detail, and specific embodiments are used for elaboration herein. The description of the above embodiments is only used to help understand the method and its core idea of the present invention, and does not impose any form of limitation on the present invention.

[0035] As Figure 1 shown, the present application provides an all-terrain vehicle 100, including a frame 10, a body cover 20, a suspension system 30, a running system 40, and a steering system 50. The body cover 20 covers at least part of the frame 10, and the body cover 20 includes but is not limited to an engine hood, a luggage compartment lid, a door, a fender, a body side panel, a roof panel, etc. The suspension system 30 is connected between the frame 10 and the running system 40, and is used to transmit the force and torque between the frame 10 and the running system 40, and reduce the vibration generated by the uneven road surface during the running of the all-terrain vehicle 100. At least part of the running system 40 is located below the frame 10 and is used to support the all-terrain vehicle 100. The running system 40 includes a front wheel 41 and a rear wheel 42, and the steering system 50 is connected to the front wheel 41, and the steering system 50 includes a steering handle 51.

[0036] As Figure 2As shown, further, the all-terrain vehicle 100 further includes a hydraulic braking system 60, and the hydraulic braking system 60 is used to decelerate and stop the vehicle.

[0037] As Figure 2 and Figure 3 shown, as an implementation manner, the hydraulic braking system 60 includes a hydraulic braking device 61, a front-wheel braking assembly 62, a rear-wheel braking assembly 63, a handbrake pump 64 and a brake pedal 65. The front-wheel braking assembly 62 is installed on the front wheels 41, and the rear-wheel braking assembly 63 is installed on the rear wheels 42. The handbrake pump 64 is used to control the front-wheel braking assembly 62, and the brake pedal 65 is used to control both the front-wheel braking assembly 62 and the rear-wheel braking assembly 63 at the same time. Specifically, the handbrake pump 64 is installed on the steering handle 51, and a handbrake (not shown in the figure) is provided on the steering handle 51. The handbrake pump 64 can apply pressure to the front-wheel braking assembly 62 under the action of the handbrake.

[0038] As Figure 3 shown, specifically, the hydraulic braking device 61 is a hydraulic pump. The hydraulic pump includes a pump body 611, a piston mechanism 612, a connecting rod mechanism 613 and an elastic mechanism 614. The pump body 611 forms a chamber 6111, and the chamber 6111 provides a receiving space for the oil fluid and allows the oil fluid to flow inside the chamber 6111. The piston mechanism 612 is disposed in the chamber 6111 and can move in the chamber 6111. The elastic mechanism 614 is used to abut against the piston mechanism 612. After the piston mechanism 612 moves, the piston mechanism 612 can reset under the action of the elastic mechanism 614 and adjust the internal pressure of the pump body 611. One end of the connecting rod mechanism 613 is connected to the piston mechanism 612, and the other end of the connecting rod mechanism 613 is connected to the brake pedal 65. The connecting rod mechanism 613 can drive the piston mechanism 612 to move under the action of the brake pedal 65.

[0039] Specifically, the pump body 611 is provided with a handbrake oil inlet 6112, a first oil outlet 6113, a second oil outlet 6114 and a liquid supplement port 6115 that communicate with the chamber 6111. The handbrake oil inlet 6112 is connected to the handbrake pump 64 through an oil delivery pipe. The first oil outlet 6113 is connected to the pressure port of the rear-wheel braking assembly 63 through an oil delivery pipe. The second oil outlet 6114 is connected to the pressure port of the front-wheel braking assembly 62 through an oil delivery pipe. The oil delivery pipe is a pipe for transporting the oil fluid. The connecting rod mechanism 613 drives the piston mechanism 612 to move under the action of the brake pedal 65, so that the oil fluid leaves the chamber 6111 through the first oil outlet 6113 and the second oil outlet 6114. The handbrake oil inlet 6112 is used to receive the pressure generated by the handbrake pump 64, so that the oil fluid leaves the chamber 6111 through the second oil outlet 6114.

[0040] Exemplarily, the hydraulic braking system 60 further includes an oil pot (not shown in the figure), and the oil pot is used to store the hydraulic fluid. The fluid replenishing port 6115 is connected to the oil pot. The oil pot can replenish the hydraulic fluid into the chamber 6111 through the fluid replenishing port 6115. When the pressure in the chamber 6111 increases, the hydraulic braking device 61 can press at least part of the hydraulic fluid into the oil pot through the fluid replenishing port 6115. The pressure balance inside the hydraulic braking device 61 during operation is achieved through the oil pot communicated with the fluid replenishing port 6115.

[0041] As Figure 2 shown, optionally, the hydraulic braking system 60 further includes an anti-lock mechanism 66. The anti-lock mechanism 66 is disposed between the hydraulic braking device 61 and the front-wheel braking assembly 62, and between the hydraulic braking device 61 and the rear-wheel braking assembly 63. When the vehicle brakes suddenly or brakes on a low-adhesion road surface, the anti-lock mechanism 66 can prevent the tires from locking, ensuring that the vehicle still has a certain steering ability and improving driving safety. The anti-lock mechanism 66 has two hydraulic circuit interfaces, and the two hydraulic circuit interfaces are respectively connected to the first oil outlet 6113 and the second oil outlet 6114, so that the anti-lock mechanism 66 can directly control the hydraulic pressure distribution of the front-wheel braking assembly 62 and the rear-wheel braking assembly 63.

[0042] In the embodiment of the present application, in the absence of a braking operation, the hydraulic braking device 61 does not receive any external force, the piston mechanism 612 is located at the initial position of the chamber 6111, and the elastic mechanism 614 is in a natural state. When the driver steps on the brake pedal 65, the brake pedal 65 transmits a force to the hydraulic braking device 61 through the link mechanism 613. The link mechanism 613 drives the piston mechanism 612 to move in the chamber 6111 under the pressure of the brake pedal 65, so that the hydraulic fluid leaves the chamber 6111 through the first oil outlet 6113 and the second oil outlet 6114. The hydraulic fluid flows through the pressure port of the rear-wheel braking assembly 63 through the first oil outlet 6113, thereby providing the required braking pressure for the rear-wheel braking assembly 63; at the same time, the hydraulic fluid flows through the pressure port of the front-wheel braking assembly 62 through the second oil outlet 6114, providing hydraulic support for the front-wheel braking assembly 62. During the handbrake operation, the handbrake pump 64 transmits the pressure to the chamber 6111 through the handbrake oil inlet 6112, and the hydraulic fluid flows through the front-wheel braking assembly 62 through the first oil outlet 6113.

[0043] Under the input changes of the brake pedal 65 and / or the handbrake, the flow and pressure distribution of the hydraulic oil are controlled through the cooperation of the piston mechanism 612, the elastic mechanism 614, and the linkage mechanism 613, only changing the output conditions of different oil outlets of the hydraulic braking device 61, so as to achieve the control of the front wheel braking assembly 62 and / or the rear wheel braking assembly 63 through different control methods. The hydraulic pump of the hydraulic braking system 60 integrates the function of hydraulic distribution, making the components required for the hydraulic braking system 60 to achieve hydraulic transmission fewer, improving the airtightness of the system, and making the braking effect more stable.

[0044] As Figures 3 to 5 shown, as an implementation method, the hydraulic braking device 61 further includes a sealing mechanism 615. The sealing mechanism 615 is installed in the chamber 6111 and fixed to the pump body 611. The sealing mechanism 615 includes a chamber seal 6151, a first seal 6152, and a second seal 6153. The chamber seal 6151 is used to cooperate with the piston mechanism 612 to divide the chamber 6111 into a first chamber 6111a and a second chamber 6111b (see Figure 6 ), the first chamber 6111a is communicated with the first oil outlet 6113, the second chamber 6111b is communicated with the second oil outlet 6114. The piston mechanism 612 includes a first piston 6121 and a second piston 6122. The first piston 6121 is arranged in the first chamber 6111a, and the second piston 6122 is arranged in the second chamber 6111b. The first seal 6152 and the second seal 6153 are respectively sleeved on the first piston 6121 and the second piston 6122. The first piston 6121 and the second piston 6122 are respectively provided with a first compensation hole 6121a and a second compensation hole 6122a. The liquid replenishing port 6115 can be communicated with the first chamber 6111a through the first compensation hole 6121a, and the handbrake oil inlet 6112 can be communicated with the second chamber 6111b through the second compensation hole 6122a.

[0045] In different braking modes, through the cooperation of the first seal 6152 and the first compensation hole 6121a, and / or the cooperation of the second seal 6153 and the second compensation hole 6122a, the flow path of the oil fluid is controlled, and then it is determined whether the oil fluid can flow into the first chamber 6111a through the first compensation hole 6121a, and / or whether the oil fluid can flow into the second chamber 6111b through the second compensation hole 6122a, thereby changing the pressure in the first chamber 6111a or the second chamber 6111b, controlling the output of different oil outlets, and realizing the function of hydraulic distribution.

[0046] With the above settings, the pressures in the first chamber 6111a and the second chamber 6111b can be pressurized according to the externally input pressure (the pressurization process of the hydraulic braking device 61 refers to the process in which the hydraulic braking device 61 builds up the working pressure from the initial state), enabling the hydraulic braking device 61 to integrate the function of hydraulic distribution. As a result, the number of components required for the hydraulic braking system 60 to achieve hydraulic transmission is reduced, the airtightness of the hydraulic braking system 60 is improved, and the hydraulic braking system 60 can achieve precise hydraulic braking control.

[0047] As Figure 4 and 5 shown, optionally, a limiting hole 6123 is provided on the side wall of the first piston 6121 or the second piston 6122, and a limiting member 6124 fixed to the pump body 611 is provided in the limiting hole 6123. When the piston mechanism 612 is subjected to the force of the link mechanism 613, the limiting member 6124 in the limiting hole 6123 will limit the maximum displacement range of the piston mechanism 612.

[0048] Exemplarily, the limiting member 6124 includes, but is not limited to, a pin - type limiting member, a groove - type limiting member, an elastic limiting member, a fixed stop - type limiting member, etc. For example, the limiting hole 6123 penetrates the second piston 6122 along the radial direction of the second piston 6122, and the limiting hole 6123 is set as an oval - shaped hole. The limiting member 6124 is set as a pin - type limiting member, and both ends of the pin - type limiting member are fixed on the pump body 611, playing a mechanical limiting role to ensure that the movement of the piston mechanism 612 does not exceed the predetermined stroke. Here, the predetermined stroke refers to the major - axis dimension of the oval - shaped hole, that is, the distance that the limiting member 6124 can move in the limiting hole 6123 during the movement of the piston mechanism 612.

[0049] As Figure 6 and Figure 7 shown, as a realization method, when the elastic mechanism 614 is in the initial state, the first chamber 6111a is communicated with the liquid replenishing port 6115 through the first compensation hole 6121a opened on the first piston 6121, and the second chamber 6111b is communicated with the hand - brake oil inlet 6112 through the second compensation hole 6122a opened on the second piston 6122, enabling the inflow / outflow of the oil to be carried out independently in the first chamber 6111a and the second chamber 6111b respectively.

[0050] When the elastic mechanism 614 is in the compressed state, the first compensation hole 6121a and the second compensation hole 6122a can be blocked by the first sealing member 6152 and the second sealing member 6153 respectively, and the first chamber 6111a and the second chamber 6111b are pressurized.

[0051] Specifically, the first compensation hole 6121a is located on the side wall of the first piston 6121, and the second compensation hole 6122a is located on the side wall of the second piston 6122. The function of the first compensation hole 6121a is to adjust the pressure balance between the first chamber 6111a and the liquid filling port 6115, and the function of the second compensation hole 6122a is to adjust the pressure balance between the second chamber 6111b and the handbrake oil inlet 6112. When the first seal 6152 blocks the first compensation hole 6121a, the first chamber 6111a starts to build pressure. When the second seal 6153 blocks the second compensation hole 6122a, the second chamber 6111b starts to build pressure.

[0052] As Figure 7 shown, as an implementation, the first piston 6121 has a first liquid storage chamber 6121b communicating with the first chamber 6111a, and the second piston 6122 has a second liquid storage chamber 6122b communicating with the second chamber 6111b. When the elastic mechanism 614 is in the initial state, the first liquid storage chamber 6121b communicates with the liquid filling port 6115 through the first compensation hole 6121a opened on the first piston 6121, and the second liquid storage chamber 6122b communicates with the handbrake oil inlet 6112 through the second compensation hole 6122a opened on the second piston 6122, enabling the inflow / outflow of the oil to be independently carried out in the first chamber 6111a and the second chamber 6111b respectively.

[0053] Among them, the first liquid storage chamber 6121b has a first opening 6121d communicating with the first chamber 6111a. The opening direction of the first liquid storage chamber 6121b faces the second piston 6122, and at least part of the first elastic member 6141 is disposed in the first liquid storage chamber 6121b. The second liquid storage chamber 6122b has a second opening 6122d communicating with the second chamber 6111b. The opening direction of the second liquid storage chamber 6122b is the same as the opening direction of the first liquid storage chamber 6121b, and at least part of the second elastic member 6142 is disposed in the second liquid storage chamber 6122b. When the oil enters the first chamber 6111a and the second chamber 6111b from the first liquid storage chamber 6121b and the second liquid storage chamber 6122b respectively, under the condition of pressure change, the oil will flow into the first chamber 6111a and the second chamber 6111b through the first opening 6121d and the second opening 6122d respectively.

[0054] As Figure 4 、 Figure 5 and Figure 7As shown, as an implementation, the elastic mechanism 614 further includes a first elastic member 6141 and a second elastic member 6142. Two ends of the first elastic member 6141 are respectively connected to the first piston 6121 and the second piston 6122, and at least a part of the first elastic member 6141 is located in the first liquid storage cavity 6121b. Two ends of the second elastic member 6142 are respectively connected to the second piston 6122 and the inner wall of the pump body 611, and at least a part of the second elastic member 6142 is arranged in the second liquid storage cavity 6122b. When the link mechanism 613 is subjected to an externally input force, the link mechanism 613 will transmit the force to the piston mechanism 612. In this process, the elastic mechanism 614 converts the received pressure into elastic potential energy. When the force applied by the link mechanism 613 disappears, the first elastic member 6141 and the second elastic member 6142 drive the piston mechanism 612 to reset.

[0055] Further, the elastic coefficient of the first elastic member 6141 is less than that of the second elastic member 6142. When the piston mechanism 612 is subjected to the force applied by the link mechanism 613, the first piston 6121 and the second piston 6122 can move synchronously. It should be noted that if the elastic coefficient of the first elastic member 6141 is greater than that of the second elastic member 6142, when the piston mechanism 612 is subjected to the force applied by the link mechanism 613, it is possible that the second piston 6121 moves while the first piston 6122 remains stationary. In this case, the rear wheel braking assembly 63 may have a problem of insufficient braking force, affecting the braking effect of the all-terrain vehicle 100. Through the above settings, the link mechanism 613 can drive the first piston 6121 and the second piston 6122 to move synchronously under the action of the brake pedal 65, so that the first chamber 6111a and the second chamber 6111b build pressure synchronously, so as to achieve the purpose of synchronous operation of the front wheel braking assembly 62 and the rear wheel braking assembly 63.

[0056] As Figure 7 As shown, as an implementation, the piston mechanism 612 further includes a guide member 6125. The guide member 6125 is arranged between the first piston 6121 and the second piston 6122. The first piston 6121 has a first positioning portion 6121c extending along its axial direction. The first positioning portion 6121c is located in the first liquid storage cavity 6121b and extends towards the direction of the first opening 6121d, so that at least a part of the first positioning portion 6121c passes through the guide member 6125 and has a clearance fit with the guide member 6125. Through the clearance fit with the first positioning portion 6121c, when the first piston 6121 moves, the first positioning portion 6121c can move within the clearance range of the guide member 6125, ensuring that the first piston 6121 only moves along its axial direction, avoiding the offset of the first piston 6121 and reducing the wear of the first piston 6121.

[0057] Optionally, the guide member 6125 is disposed between the second piston 6122 and the inner wall of the pump body 611. The second piston 6122 has a second positioning portion 6122c extending along its axial direction. The second positioning portion 6122c is located in the second liquid storage chamber 6122b and extends towards the direction of the second opening 6122d, such that at least a part of the second positioning portion 6122c passes through the guide member 6125 and has a clearance fit with the guide member 6125, thereby ensuring that the second piston 6122 can move along its axial direction and reducing the wear of the second piston 6122.

[0058] When both the first piston 6121 and the second piston 6122 are configured with the guide member 6125, the elastic coefficient of the first elastic member 6141 and the elastic coefficient of the second elastic member 6142 satisfy any one of the following relationships:

[0059] The elastic coefficient of the first elastic member 6141 is greater than the elastic coefficient of the second elastic member 6142, and the pressure difference between the first chamber 6111a and the second chamber 6111b during the pressure building process satisfies that the pressure difference between the two chambers is within a set pressure threshold range;

[0060] Or, the elastic coefficient of the first elastic member 6141 is less than the elastic coefficient of the second elastic member 6142, and the pressure difference between the first chamber 6111a and the second chamber 6111b during the pressure building process satisfies that the pressure difference between the two chambers is within a set pressure threshold range.

[0061] Exemplarily, in the relationship satisfied by the elastic coefficient of the first elastic member 6141 and the elastic coefficient of the second elastic member 6142, the set pressure threshold range is from -0.3 MPa to 0.3 MPa.

[0062] As a way of implementation, according to different external inputs, the hydraulic braking device 61 can perform the following four different working conditions corresponding to the acting forces generated by the handbrake and the brake pedal 65:

[0063] As Figure 8 shown, in working condition one: only the acting force generated by the brake pedal 65 acts on the hydraulic braking device 61, and the hydraulic braking device 61 performs the following steps:

[0064] Step S801: The brake pedal 65 receives an external input pressure and transmits the pressure to the link mechanism 613;

[0065] Step S802: The link mechanism 613 drives the first piston 6121 to move in a set direction (the set direction refers to the direction from the first piston 6121 to the second piston 6122), such that the first compensation hole 6121a is blocked by the first seal 6152, and the first chamber 6111a builds pressure;

[0066] Step S803: The oil in the first chamber 6111a flows through the first oil outlet 6113 to the rear wheel brake assembly 63;

[0067] Step S804: The first elastic member 6141 acts on the second piston 6122, causing the second piston 6122 to move in a set direction. The second compensation hole 6122a is blocked by the second seal 6153, and the second chamber 6111b builds pressure;

[0068] Step S805: The oil in the second chamber 6111b flows through the second oil outlet 6114 to the front wheel brake assembly 62.

[0069] It should be noted that since the external input is only the brake pedal 65, the pressure build-up processes of the first chamber 6111a and the second chamber 6111b are carried out simultaneously, and the pressure in the second chamber 6111b is equal to the pressure in the first chamber 6111a, achieving synchronous braking of the front wheels 41 and the rear wheels 42 by the brake pedal 65.

[0070] As Figure 9 shown, in working condition two: The pressure generated by the brake pedal 65 acts on the hydraulic braking device 61 first, and the pressure generated by the handbrake pump 64 acts on the hydraulic braking device 61 later. The hydraulic braking device 61 performs the following steps:

[0071] Step S901: The brake pedal 65 receives the pressure input from the outside and transmits the pressure to the link mechanism 613;

[0072] Step S902: The link mechanism 613 drives the first piston 6121 to move, causing the first compensation hole 6121a to be blocked by the first seal 6152, and the first chamber 6111a builds pressure;

[0073] Among them, when the first chamber 6111a builds pressure, the pressure in the first chamber 6111a is the first pressure.

[0074] Step S903: The oil in the first chamber 6111a flows through the first oil outlet 6113 to the rear wheel brake assembly 63;

[0075] Step S904: The first elastic member 6141 drives the second piston 6122 to move under the action of the first piston 6121, causing the second compensation hole 6122a to be blocked by the second seal 6153, and the second chamber 6111b builds pressure;

[0076] Among them, when the second chamber 6111b builds pressure, the pressure in the second chamber 6111b is equal to the first pressure.

[0077] Step S905: The oil in the second chamber 6111b flows through the second oil outlet 6114 to the front wheel brake assembly 62;

[0078] Step S906: The handbrake pump 64 generates pressure. The handbrake oil inlet 6112 builds pressure in the second chamber 6111b through the gap between the second piston 6122 and the second seal 6153, increasing the pressure in the second chamber 6111b to a second pressure, which is greater than the first pressure.

[0079] It should be noted that if the pressure in the second chamber 6111b increases to the second pressure, since the pressure in the second chamber 6111b is different from that in the first chamber 6111a, the second piston 6122 will move towards the first piston 6121 under the action of the pressure to compress the first elastic member 6141 until the pressures in the second chamber 6111b and the first chamber 6111a are equal, achieving a pressure balance state within the hydraulic braking device 61.

[0080] In the embodiment of the present application, the second seal 6153 has a function of one-way pressure building, enabling the oil in the handbrake pump 64 to enter the second chamber 6111b through the gap between the second piston 6122 and the second seal 6153, increasing the pressure in the second chamber 6111b to the second pressure.

[0081] Exemplarily, the second seal 6153 is set to any one of a C-shaped leather cup or an E-shaped leather cup.

[0082] As Figure 10 shown, in working condition three: only the pressure generated by the handbrake pump 64 acts on the hydraulic braking device 61, and the hydraulic braking device 61 performs the following steps:

[0083] Step S1001: The handbrake pump 64 receives an externally input pressure and transmits the pressure to the handbrake oil inlet 6112;

[0084] Step S1002: The handbrake oil inlet 6112 receives the oil flowing in from the handbrake pump 64, enabling the oil to enter the second chamber 6111b through the second compensation hole 6122a, and the second chamber 6111b builds pressure;

[0085] Step S1003: The oil in the second chamber 6111b flows through the second oil outlet 6114 to the front wheel braking assembly 62.

[0086] It should be noted that since the link mechanism 613 does not exert pressure on the piston mechanism 612 and the piston mechanism 612 is at the initial position in the chamber 6111, the second compensation hole 6122a is not blocked by the second sealing mechanism 615 at this time, enabling the oil to flow from the handbrake oil inlet 6112 through the second compensation hole 6122a and enter the second chamber 6111b, building pressure in the second chamber 6111b, and achieving the effect of the handbrake independently controlling the braking of the front wheels 41.

[0087] As Figure 11As shown in the figure, in working condition four: the pressure generated by the handbrake pump 64 acts on the hydraulic braking device 61 first, and the pressure generated by the brake pedal 65 acts on the hydraulic braking device 61 later. The hydraulic braking device 61 performs the following steps:

[0088] Step S1101: The handbrake pump 64 receives the externally input pressure and transmits the pressure to the handbrake inlet 6112.

[0089] Step S1102: The handbrake inlet 6112 receives the oil flowing in from the handbrake pump 64, allowing the oil to enter the second chamber 6111b through the second compensation hole 6122a, and the second chamber 6111b builds pressure.

[0090] Step S1103: The oil in the second chamber 6111b flows through the second outlet 6114 to the front-wheel braking assembly 62.

[0091] Step S1104: The brake pedal 65 receives the externally input pressure and transmits the pressure to the linkage mechanism 613.

[0092] Step S1105: The linkage mechanism 613 drives the first piston 6121 to move, causing the first compensation hole 6121a to be blocked by the first seal 6152, and the first chamber 6111a builds pressure.

[0093] Step S1106: The oil in the first chamber 6111a flows through the first outlet 6113 to the rear-wheel braking assembly 63.

[0094] Among them, since the linkage mechanism 613 drives the first piston 6121 to move, the first elastic member 6141 connected to the first piston 6121 will drive the second piston 6122 to move to compress the space of the second chamber 6111b. If the pressure generated by the second chamber 6111b building pressure under the action of the handbrake pump 64 is P1, and the pressure generated by the first chamber 6111a building pressure under the action of the linkage mechanism 613 is P2, then the pressure generated after the second chamber 6111b is compressed is P3 (P3 = P1 + P2). Since the pressure P3 of the second chamber 6111b is greater than the pressure P2 of the first chamber 6111a at this time, the second piston 6122 moves in the direction close to the first piston 6121 to compress the first elastic member 6141 until the pressures of the second chamber 6111b and the first chamber 6111a are equal, making the hydraulic braking device 61 reach a state of pressure balance.

[0095] In summary, in the embodiment of the present application, the hydraulic braking device 61 integrates the function of hydraulic distribution, enabling the hydraulic braking system 60 to have fewer components required for hydraulic transmission, improving the airtightness of the system, and making the braking effect more stable.

[0096] It should be understood that those of ordinary skill in the art can make improvements or modifications based on the above description, and all such improvements and modifications shall fall within the protection scope of the appended claims of this application.

Claims

1. A hydraulic brake device, which is applied to a hydraulic brake system of an all-terrain vehicle, wherein the hydraulic brake system comprises a front wheel brake assembly, a rear wheel brake assembly and a hand brake pump; the hydraulic brake device comprises: a pump body, the pump body forming a chamber; a piston mechanism, the piston mechanism being disposed in the chamber and being movable in the chamber; A sealing mechanism, the sealing mechanism is installed in the chamber and fixed to the pump body; A connecting rod mechanism, wherein the connecting rod mechanism is used to drive the piston mechanism; an elastic mechanism, the elastic mechanism being used to reset the piston mechanism; The invention is characterized in that the pump body is provided with a handbrake oil inlet, a first oil outlet, a second oil outlet and a fluid replenishing port which are connected with the chamber, the handbrake oil inlet is used to be connected with the handbrake pump through an oil delivery pipe, the first oil outlet is connected with the rear wheel brake assembly through an oil delivery pipe, and the second oil outlet is connected with the front wheel brake assembly through an oil delivery pipe; the sealing mechanism comprises a chamber seal, a first seal and a second seal, the chamber seal cooperates with the piston mechanism to separate the chamber into a first chamber connected with the first oil outlet and a second chamber connected with the second oil outlet, the piston mechanism comprises a first piston arranged in the first chamber and a second piston arranged in the second chamber, the first seal and the second seal are respectively sleeved on the first piston and the second piston, a first compensation hole is provided on the first piston, a second compensation hole is provided on the second piston, the fluid replenishing port can be connected with the first chamber through the first compensation hole, and the handbrake oil inlet can be connected with the second chamber through the second compensation hole; When the elastic mechanism is in an initial state, the fluid filling port is connected to the first chamber through the first compensation hole, and the handbrake oil inlet is connected to the second chamber through the second compensation hole; when the elastic mechanism is in a compressed state, the first compensation hole and the second compensation hole can be blocked by the first seal and the second seal respectively, and the first chamber and the second chamber are pressurized.

2. The hydraulic brake device according to claim 1, characterized in that: The elastic mechanism includes a first elastic member and a second elastic member, the first elastic member is arranged between the first piston and the second piston, the second elastic member is arranged between the second piston and the pump body, the first elastic member and the second elastic member have the same deformation direction, and the elastic coefficient of the first elastic member is smaller than the elastic coefficient of the second elastic member.

3. The hydraulic brake device according to claim 2, characterized in that: The hydraulic brake system includes a brake pedal, which is connected to the connecting rod mechanism. The connecting rod mechanism can drive the first piston to move in a set direction under the action of the brake pedal. When the first piston moves, the first compensation hole is blocked by the first seal, so that the first chamber is pressurized, and the oil in the first chamber can flow through the rear wheel brake assembly through the first oil outlet; the first elastic member acts on the second piston, so that the second piston moves in the set direction, and the second compensation hole is blocked by the second seal, so that the second chamber is pressurized, and the oil in the second chamber can flow through the front wheel brake assembly through the second oil outlet.

4. The hydraulic brake device according to claim 3, characterized in that: When the connecting rod mechanism drives the first piston to move, the pressure in the first chamber is a first pressure, and the pressure in the second chamber is equal to the first pressure; if the handbrake pump generates pressure after the connecting rod mechanism acts, the handbrake oil inlet can build up pressure in the second chamber through the gap between the second seal and the second piston, so that the pressure in the second chamber increases to a second pressure, and the second pressure is greater than the first pressure.

5. The hydraulic brake device according to claim 2, characterized in that: When the handbrake pump generates pressure, the handbrake oil inlet can receive the oil flowing in from the handbrake pump, allowing the oil to enter the second chamber through the second compensation hole to build up pressure in the second chamber, so that the oil in the second chamber can flow through the front wheel brake assembly through the second oil outlet.

6. The hydraulic brake device according to claim 5, characterized in that: When the handbrake pump generates pressure, the oil in the second chamber can flow through the front wheel brake assembly through the second oil outlet; the hydraulic brake system includes a brake pedal, which is connected to the connecting rod mechanism, and the connecting rod mechanism can drive the first piston to move in a set direction under the action of the brake pedal. If the connecting rod mechanism drives the first piston to move in the set direction after the handbrake pump is acted on, the first compensation hole is blocked by the first seal, so that the first chamber builds up pressure, and the oil in the first chamber can flow through the rear wheel brake assembly through the first oil outlet.

7. The hydraulic brake device according to claim 2, characterized in that: A first liquid storage cavity is formed around the first piston, the first liquid storage cavity is communicated with the first compensation hole, and the first liquid storage cavity includes an opening communicated with the first chamber, the opening direction of the first liquid storage cavity faces the second piston, and at least a part of the first elastic member is disposed in the first liquid storage cavity; A second liquid storage chamber is formed around the second piston, the second liquid storage chamber is connected to the second compensation hole, and the second liquid storage chamber includes an opening connected to the second chamber, the opening direction of the second liquid storage chamber is the same as the opening direction of the first liquid storage chamber, and at least a portion of the second elastic member is arranged in the second liquid storage chamber.

8. The hydraulic brake device according to claim 7, characterized in that: The piston mechanism includes a guide member, the guide member is arranged between the first piston and the second piston, the first piston includes a first positioning portion extending along its axial direction, the first positioning portion is located in the first liquid storage cavity, at least part of the first positioning portion passes through the guide member and is in clearance fit with the guide member; And / or the guide member is arranged between the second piston and the pump body, the second piston includes a second positioning portion extending along its axial direction, the second positioning portion is located in the second liquid storage chamber, at least part of the second positioning portion passes through the guide member and is gap-matched with the guide member.

9. The hydraulic brake device according to claim 1, characterized in that: A limiting hole is arranged on the side wall of the first piston or the second piston, and a limiting member fixed to the pump body is arranged in the limiting hole to limit the maximum displacement of the piston mechanism.

10. The hydraulic brake device according to claim 9, characterized in that: The limiting hole penetrates the second piston in a radial direction of the second piston. The limiting hole is configured as a waist-shaped hole, and the waist length of the waist-shaped hole is equal to the maximum displacement distance of the piston mechanism.

11. An all-terrain vehicle comprising: Frame; a suspension system connected to the vehicle frame; A walking system, the walking system is connected to the suspension system, and the walking system includes front wheels and rear wheels; A steering system, the steering system is connected to the front wheel, and the steering system includes a steering handle; A hydraulic brake system, the hydraulic brake system comprising a front wheel brake assembly, a rear wheel brake assembly and a hand brake pump, the front wheel brake assembly is mounted on the front wheel, the rear wheel brake assembly is mounted on the rear wheel, and the hand brake pump is mounted on the steering handle; It is characterized in that the hydraulic braking system also includes a hydraulic braking device as described in any one of claims 1-10.

12. The all-terrain vehicle according to claim 11, characterized in that: The hydraulic brake system also includes an anti-lock mechanism connecting the front wheel brake assembly and the rear wheel brake assembly, and the anti-lock mechanism includes two hydraulic circuit interfaces, and the two hydraulic circuit interfaces are respectively connected to the first oil outlet and the second oil outlet.

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